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Printable PDF of Figure 4.3-1, on measuring bearings. It's a little easier to measure the angles without the curvature caused by the spine of the printed book.
A new section on Star and Planet Brightness (will replace 11.20 in future editions since the gov closed down both the time tics and the storm warnings)
Free Nautical Almanacs to download.
Excellent way to check intermediate steps from any sight reduction method: Celestial Tools by Stan Klein (plus other useful cel nav resources)
information from Pub 117 See also this note from USNO on UT (The NIST time service was threatended with closure in 2019, but it survived.)
Article on the Solar Index Correction Method
Article on the importance of evaluating a plotted fix to see that our assumptions are met.
Article on Star and Planet Brightness
Article on Star Names
Books on celestial navigation from Starpath (also available as ebooks)